Template meta-programming is a meta-programming technique in which templates are used by a compiler to generate temporary source code, which is merged by the compiler with the rest of the source code and then compiled.

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Meta-programming template for collection statistics

I find that I often want to calculate summary statistics from collections of data and decided to create a template to do that. I'm interested in a general review, but I also have some specific ...
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61 views

Compile Time Constant Map

I have implemented this compile time map as a way to learn templates and constexpr classes: ...
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1answer
39 views

Variadic template for concisely defining a tuple whose components are all the same type

C++11 provides a std::tuple template, but it requires the types of all the fields to be listed individually, which is inconvenient if there are many fields and ...
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40 views

Counting words in files - follow-up 4

Previous question: Counting words in files - follow-up 2 Continuation of the meta programming template version of counting words. Inspired by example of pirntf ...
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38 views

Counting words in files - follow-up 2

Previous question: Counting words in files - follow-up I have fixed punctuation problems in my previous code by using template, because it is easy to understand and my focus on template mechanism. ...
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3answers
101 views

Use of macros to aid visual parsing of SFINAE template metaprogramming

I've recently been introduced to SFINAE to solve the problem of unwanted promotion precedence. i.e. I was hoping to catch integer types with Foo::Foo(long) and ...
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1answer
34 views

“event_foo” method event system in D

The goal is to be able to call an event_<name> method on an object if it implements it, or otherwise do nothing, without needing to explicitly define and ...
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306 views

Policy-based, variadic logger class in C++

I've been exploring design based around some of the more advanced C++11 features lately, and some of them are turning out to be rather useful for some projects I'm working on. One is this ...
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1answer
200 views

Variadic template data pack strucuture designed for debug/trace log (variable-sized records)

I am currently writing this pack template to pack all the values (raw / fundamental + arrays of such, especially c-strings and ...
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2answers
104 views

writeln() and format() with variadic templates

I wanted to get better acquainted with variadic templates, so I decide to try to implement a function like D's writeln(), just for fun. ...
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1answer
65 views

C++ messaging using templates

I wanted to allow components of my program to communicate without the components knowing about each other, thus keeping coupling low. So I devised some template classes that implement the observer ...
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2answers
162 views

Value Iteration Implementation for MDPs

I've been working for a while on a decision theory library, and since I've never really had any formal training in code best practices I'd love to hear your feedback. This particular class is one of ...
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0answers
98 views

CRTP object counter to track accidental singleton instantiation

I have used CRTP to implement an object counter for singleton classes. This way I can keep track of accidental attempts to instantiate more than one object. It is a header only class: ...
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1answer
227 views

Template integer range

This is a follow-up of an old question by @LokiAstari, modified for the current community challenge. The idea is to provide a compile-time integer range. I applied all the modifications that I ...
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150 views

Function object passing for a task scheduler

Here is my full implementation of a generic Functor-like class: ...
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2answers
158 views

Providing const- and non-const overloads of a strstr() implementation

In a question about reimplementing strstr(), I posted an answer. I pointed out a need for const- and non-const versions of the function, and provided ...
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2answers
642 views

std::tuple foreach implementation

I wrote a "foreach" implementation for std::tuple: ...
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1answer
211 views

std::tuple objects or rvalue references?

I have some small "plugin system" (not sure this is right name). It allow you to store objects (plugins), and then call some methods from each of them. With this approach we have absolutely no ...
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1answer
122 views

Test whether a type T is among the types of a tuple

In SO I asked for a way to do it without variadics. I also provided a typical "normal" implementation with variadics : ...
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1answer
108 views

Template function specialization with code duplication

I'm working on a libcurl binding for NodeJS, and to get info from a curl handler, using curl_easy_getinfo, I've created a template function, the issue, is that the ...
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1answer
218 views

User defined literal for std::integral_constant

I created a user defined literal _c to convert an "integer" literal into an std::integral_constant. Basically, the goal is to ...
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86 views

Template container simulating SQL “select” and “where”

I want to simulate, in C++, the fact that in a form with drop down (or combo boxes), you can filter by selecting items and then projecting on a given set of properties for these item. In a SQL-like ...
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1answer
196 views

Basic templating engine in F# using F# syntax

I've been working on a rough idea for a templating engine (mostly as a learning project) using the F# syntax. How "correct" is my code in terms of being idiomatic F#? Are there F# features which would ...
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2answers
1k views

Compile time decorator pattern in C++ with templates

I'm doing some high energy physics modelling in C++. I have written code that implements class that score interactions of particles with detector material. Here is a base class: ...
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1answer
91 views

Dynamically call lambda based on stream input: Try 3

Based on Dynamically call lambda based on stream input: Try 2 This fixes most of the points pointed out by @Morwenn. It has been generalized so anybody can call it. The only extra part needed by the ...
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4answers
656 views

n-dimensional Euclidean space calculation templates

I have been working with C++11 code that uses std::vector[] to store coordinates. Most often this code uses 2D or 3D but it occurred to me that it may be generally ...
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2answers
118 views

Dynamically call lambda based on stream input: Try 2

Originally asked here: Dynamically call lambda based on stream input The following version is based heavily on the answer provided by @iavr though I hope that I have done enough more to mkae it worth ...
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1answer
188 views

C++ template range

From a previous question I got an answer that included some template magic (that to be blunt was mind-boggling (as I could not understand it)). So I have been trying to achieve the same results ...
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2answers
2k views

Unique type ID in C++

I need to have an unique ID for any type in C++ for a variant type. Is this code reliable for getting the ID? I don't care to have same ID for same type between multiple runs. Sorry for ...
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3answers
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Very basic tuple implementation

I've been messing with metaprogramming and variadic templates in C++, and I came up with this very primitive implementation of a tuple: ...
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223 views

Clone of Boost Variant

As part of learning C++, with special emphasis on C++11, I wanted to implement the equivalent of Boost's Variant (located here). My code is available at variant.hpp, with the current version given ...
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356 views

C++ class “overload” using variadic templates and wrapped function pointers

I'm using C++11 and I have the following problem (pseudo C++): ...
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323 views

Functional composition of member function predicates

In C++11, it is en vogue to use small lambda expressions to produce ad-hoc predicates. However, sometimes it's fun to create predicates in a functional, "point-free" way. That way, no function bodies ...
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128 views

CRTP overload-set nightmare [closed]

I'm not sure if this belongs on CodeReview or StackOverflow, but we'll start with it here. Here is an anonymized and simplified version of some code I have that uses the Curiously Recurring Template ...
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310 views

Building a good C++11 template library - compile-time checked enum array

The task is to add data or values to members of a given enum class. The compiler should check, if a value for each enum member is available, and not just default construct empty values. It is a tool ...
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2answers
120 views

lockbox (a boost-like container)

So I introduced myself to templates in C++11 and I have to say it's really confusing, but also very fascinating. I just need to get my head around what happens at compile time so that I don't wind up ...
3
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1answer
79 views

Should I use an object or type as trait?

Edit: Disclaimer: I am new to templates and traits. I apologize in advance if this is a bad question. I am refactoring two similar classes with small differences strewn all over them into one ...
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1answer
2k views

C++ compile-time checked switch 'statement'

In the project I work on there are several places where a switch statement is used on a type enum. (I know, better to use virtual functions or a visitor pattern or something, but sometimes switching ...
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1answer
420 views

Could this deferred execution scheme be any simpler?

I've created this scheme to preserve function calls until all the arguments are available. The stub_op classes will be replaced with classes that implement a ...
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1answer
174 views

Type to instance map

I needed a class where I could store an instance of any type. The goal was an interface as follows: ...
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1answer
605 views

Review of C++ singleton

Originally posted on Stack Overflow. So far, I've used this in a few places and it seems solid. This is what I usually do to make a singleton: ...
10
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1answer
2k views

JSON Serializer

Carrying on from: Yet another C++ Json Parser Yet another C++ Json Parser (Recursive) All the code is available from git hub: ThorsSerializer but only reviewing a small section here. The idea is ...
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1answer
325 views

How can I improve the design of this serialization mechanism?

I'm working on caching library which is intended to work with all types of values. Values are represented as instances of value_type: ...
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1answer
437 views

Variadic function with restricted types

I am designing a class which (among other things) acts as a vertex in an undirected graph. ...
10
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1answer
356 views

Mixin and template-heavy code for a Silverlight clone

I've made a mock version of Silverlight in D2. It is meant to output HTML, but since I don't know HTML yet, its current output is in. HTML is not the reason I'm here, though. The goal of my project ...
5
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1answer
600 views

Meta-program to find square numbers

I'm new to template meta-programming and wrote some code to determine if a number is a perfect square. For example, in my program, SQUARE<1>::value and ...